Combination lapping and testing machine for gears



B. J. WOLFE July 4, 1933.

COMBINATION L APPING AND TESTING MACHINE FOR GEARS Filed May 27, 1930 5 Sheets'-Sheet l wb ww INVENTOR July 4, 1933., Y B. J. woLFE 1,917,178

COMBINATION LAPPING AND TESTING MACHINE FOR GEARS.

Filed May 27, 195o 5 sheets-sheet 2 INVENTOR W4 L5 ATTORN July 4 1933- B. J. woLFE 1,917,178

COMBINATION LAPPING AND TESTING MACHINE FOR GEARS Filed May 27, 1930 5 Sheets-Sheet 3 l v INVENTOR July 4, 1933- B. J. woLFE 1,917,178

COMBINATION LAPPING AND TESTING MACHINE FOR GEARS Filed May 27, 19:50 5 sheets-sheet 4 lNvENToR f'/ BY mfd/ m# /w ATTORNEY B. J. woLFE July 4, 1933.

COMBINATION LAPPING AND TSTING MACHINE FOR GEARS 5 Sheets-Sheet 5 Filed May 27, 1930 lll/[ fig. /4

Patented July 41, 1933 nnirsn STATESPATENT OFFICE BERNARD Il. WOLFE, 0F ROCHESTER, NEW YORK, ASSIGN'OIt TO GLEASON WORKS, OF ROCHESTER, NEW YORKy A CORPORATION OF NEW YORK COMBINATION LAPPING AND TESTING MACHINE FOR GEAR/S Application led May 27,

ri'fhe present invention relates to a machine for the lapping and testing of gears and particularly of spur gears.

The primary purpose of this invention is to provide a machine on which spur gears of various sizes and descriptions may be quickly and expeditiously tested or lapped.' To this end, one of the objects of this invention is to provide a combination rlapping' and testing machine in which the adjustments required for handling all gears withinthe range of the machine are reduced to a minimum.

A further purpose of this invention is to provide an improved method of lubricating the bearings of the machine, particularly the bearings of the two gear spindles.

A still further purpose of this invention is to provide an improved method of supplying the lapping compound to the gears, when the machine is being used for lapping, a method whereby cakiiig of the lapping compound or settlin,v prevented. Y

Another feature of the invention is the provision an improved form of lapping guard whereby gears which have to be chucked at different distances from the noses of the gear spindles, can be adequately guarded during the lapping operation.

@ther objects of the invention will appear hereinafter from the specification and from the recital of the appended claims.l

ln the drawings Figure 1 is a side elevation of a comb'nation spur gear lapping and testing machine constructed according to this invention, with the gears removed from the two heads;

Figure 2 is a plan view of this machine, with the lapping guard thrown back, showing a set of gears mounted thereon for lapping;

Figure 3 a vertical. sectional view through o; out of the abrasive is absolutely one of the gear heads, the gear being removed,

the section being taken on the line 3-3 of Figure el;

T1' 1 .siguio e Fi ure 3;

Figure 5 is a fragmentary view of the other head, showing a detail of the drive spindle; Figure G is a vertical sectional view of the telescoping guards secured tothe head shown is a section on the line 4 4 of 1930. Serial No. 456,006.`

in Figure 3, the section being taken on the line 6-6 of Figure 7;

Figure 7 is a section on the line 7 7 of Figure 6;

Figure 8 is a transverse sectional View of one section of the lapping guards, the view being taken onl the lineB-S of Figure 9;

Figure 9 is asectional view taken on the Aline 9 9 of Figure 8;

I rest, the section being taken on the line 11-11 of Figure 12; Figure 12 is a section taken on the line 12-12 of Figure 11; i Y

Figure 13 is a fragmentary view of one of the gear heads, showing details of the oiling system forlubricating the spindle bearmgs f l 4 y Figure v14 is a fragmentary sectional viev: through the head, further illustrating the oiling system, the section being taken on the line 141-14 of Figure 13;

Figure 15 is a fragmentary plan view of the frame of the machine, showing details of th ways on which one of the heads slides;

Figure 16 is a fragmentary sectional view, showing details of the lapping-compound pump and reservoir; and

Figure 17 is a View showing details of thc mounting of the lapping-compound pump, being a section taken on the line 17-17 of Figure 1.

Figures 3, 4, 5, e, 7, s, 9, io, i1, i2, is, 14,

rand 16 are on an enlarged scale as compared of which is to be clearly seen in Figures 1 and 2.1 The frame is formed on its uppe: face with two sets of ways that extend at right angles to each other. Two `heads 21 and 2Q, are mounted on the frame for slid-4 able adjustment on these ways. One of thev heads carries a spindle to which one of th(v l... iD

. ,fgibs on the bolts.

Y so

gears to be tested or lapped is secured and the other head carries the spindle to Which the other gear of the pair being tested or lapped is secured.

The head 21 can be adjusted on the frame by rotatingl the hand-Wheel 23 (Figure 1) which is secured to the screw 24 (Figures 3 and that threads into the nut 25 which is secured to the bottom of the head 21.

The head 22 can be adjusted on its Ways on the frame in a similar manner by rotation of the hand-Wheel 27 (Figure 1) which is secured to a screw similar to the screw 24 that threads into a nut, similar to the nut 25, which is secured to the head 22- The head 21 can be secured in any adjusted position by rotating` the clamp-lever 23 (Fig ures 1 and 4) which is journaled on the stud 29 (Figures 3 and 4) that is threaded into the head 21. The lever 23 is connected at points diametrically opposed with reference to the stud 29, WithtWo links 30 and 31. These connections are by means of the studs 32 and 33 Which are pivotally mounted in the inner end of the lever andV thread into the tivo links. rlhe tvvo links are pinned at their outer ends to nuts 34 and 35', respectively, Which thread onto bolts 36 and 37, respectively. The bolts 36 and 37 are keyed to gibs or clamp-plates 40 against rotation relative thereto, clearly shown in Figure' 4. The lock-nuts 41 and Washers 42 hold the The gibs 40 engage beneath the guide-rails 44 of the frame. lt will be readily seen that Whenl the lever 28 is moved in one direction, the nuts 34 and 35 will be threaded up on their respective bolts 36 and 37 Ato clamp the head21 to the frame and when the lever is rotated in the opposite direction, the gibs 40 vvill be released to permit adjustment oic the head on the frame.

By mechanism of identical construction, operated by the lever 45 (Figure 1) the head 22 can be clamped in any adjusted position on the frame.

llt will be noted that the frame is cast With va longitudinal groove, as indicated in Figures 3, 4 and 15, to receive the screw 24 and nut 25. ln addition7 the frame is formed with a 'lf-slot 48 (Figures 4 and 15) which extends parallel to the screw 47, that is, in the direction of adjustment of the head 21, the purpose of Which Will appear hereinafter.

The frame formed with a groove similar to the groove 47 but which extends at right angles to the groove 47. in which the screw and nut controlled by the hand-Wheel 2'? operate.

rlournaled in the head 21 is a spindle 50 to which is secured one of the gears which is to be lapped or tested. This spindle is mounted in the head so that its axis extends in a direction parallel to the direction of adjustment of the head. The spindle 50 is mounted in the head on anti-friction bearings 51, 52 and 53. rlhe bearings are a special matched type of ball bearing mounted under an initial load to Yeliminate radial or axial deflection of the spindle.

The 'earings 51 and 52 are held on the spindle against axial movement by means of a collar 54 andthe nuts 55 and 56, the latter being threaded onto the spindle. The collar 54 secured in position by means oi the ring 57 and the screws 53 which secure the ring to the head 21. il. cap 59 mounted on the spindle forms, with the collar 54, a labyrinth seal, preventing` dirt or the lapping compound 'from getting into the bearings.

rllhe bearing 53 is held in position by means oit a shoulder 50 formed on the spindle and a collar 61. rl"he collar G1 is held in position by means ot the nuts 62 which thread onto the spindle. plate 63, a labyrinth seal preventing dirt or compound entering the bearing rlhe plate 63 is secured in the bore G4 of the head, which receives the bearing 53, bymeans oi the screws 65, the heads of which engage the plate and which thread into a plate 66 mounted at'the opposite end of the bore 54. The plate is formed to provide, With the spacer-disc G7, which is secured to the spindle by a set-screw7 (33, a labyrinth seal at the inner end of the bearing 53.

`The collar 61 is keyed to the spindle 50 and has secured to it, by means of screws 69, a hand-Wheel TO. The hand-Wheel 70 serves to rotate the spindle 50 as for bringing the gear secured to the spindle into proper meshing relation with its mate gear on the spindle carried by the head 22, or lor observing the bearing on the teeth oi the gear secured in the spindle 50. etc. l guard 7 2 is secured to the han d-ivheel by means oi screws 73 to protect the operator when the machine is in operation.

Keyed to the spindle 50 intermediate its end is a brake-drum 75. ivotally mounted on a pin 76 mounted in the ears 77 cast in the head 21, are the two arms 73 and Z9 of a brake that operates on the drum rl`hese arms are lined with a suitable ln'ale-material. indicated at 80.

Slidably mounted in lug 81 secured to the head 21 is a bolt 82. rlhe bolt carries at one end a Washer 83 which held by the nuts 84 in engagement with tl e end ot the brakearm 79. rlhe bolt is of T-shape and at the end opposite that which carries the washer 33, and en the short arm ot the s piveted a lever 85. Mounted on the bolt 82 and in# terposed between the arms 73 and 79, respectively. and the lug` 31 are a pair o' springs 8l' and 83. These springs serve to bold the brake in normally released position. The arms 7S and 79 are forced together against the action of the springs to apply the brake by depression of the lever 85, the inner end of The collar 61 forms, With athe lever being cam-shaped to operate on depression of the lever.

Access can be had to the brake and to the spindle by removing the cover-plate 89 which is cast so as to be flush with the adjacent surfaces of the head and which is held in position sole-ly by the heads of the screws 90 (Figure 2) which thread into the head 21.

The spindle 95, which is adapted to carry the gear that mates with the gear carried by the spindle 50, is ournaled in the head 22 so that its artis is parallel to the airis of the spindle 50.

The work-head 22 and spindle 95 are identical in construction, respectively, with the work-head 21 and spindle 50, except that instead of a brake and brake-drum, the spindle has secured to it a pulley 96 (Figures 1 and 5). The pulley 96 is driven from the motor 9?, which is mounted in the base of the machine, by means of the belt 93 which connects the pulley 96 with the pulley 99. This pulley 99 is secured to the armature shaft of the motor. The pulley 96 serves to rotate the spindle 95 to cause the two gears being lapped or tested to rotate together when they are in mesh. l

The pulley 96 is vnotched at several points around its periphery, as indicated at 101 in Figure 5. Ahand-lever 102 (Figures 1 and 2) whicheftends through an opening 103 in the head 22 and is pivoted on a pin 104 secured in the head, can beengaged .with lany one of these notches 101 to hold the spindle 95, or, if the gearsare in mesh, both the spindle 95 and the spindle 50 against rotation when the gear chucks are being tightened up orreleased, in event that an ordinary manually operated draw-bolt and nut are used as the chuckine' apparatus.

Ball bearings are preferably used as the spindle bearings so that the machine itself may be substantially noiseless in. operation to permit the operator to detect the more readily any noises emanating from the gears being tested on the machine.

Thevball. bearings in both heads are lubricated by a hand-oiling system which forms one of the novel features of the present machine. This system filters the oil before it reaches the bearings. Thus the'machine is further protected from wear, a feature of special importance in the case of a. machine operating with an abrasive. There are separate oiling systems for the front and rear bearings, but as the oiling systems are the same for the two sets of bearings in both heads, only one system will be described here.

The heads are drilled adjacent each of the sets of forward and rear bearings to provide a vertical oil-duct (Figures 13 and le). A small oil-cup 111 of any usual or suitable construction is secured in the upper endof each duct 110. Each duct 110 leads into a pocket 112 bored into the side of they head'. A duct 113 drilled in the head leads from the pocket 112 to a point vnear the bottom of a reservoir 1111. Both the pocket 112`and reservoir 114 are 'generally cylindrical in shape. There is a screen in the reservoir chamber of a size such'that it will rest! on the walls of the chamber above the bottom of the chamber, as clearly shown in Figures 13 and 14. This screen is designated by the reference numeral 115. A mass of wool or other suitable filtering material, desigi'iated at 116, is placed on top of this screen. A duct 117 drilled into the head leads from the upper end of the reservoir chamber 1111 into a duct 118 drilled into the head at right angles to the duct 117. The duct 118 communicates with a vertical duct 119 which conducts the oil to the chamber of the ballrace.

A plate 120 which is secured to the side of the head by screws 121 serves as the outside wall of the chamber 114. This plate 120 is formed with an opening 122 extending through it and in this opening is secured a sight-glass 123. lThe glass 123 serv-es as the outside wall of the pocket 112.

As the oil must pass from the ducts 110 and 113 through the screen 115 and the filterinO' material 116 before it can reach the bearings, it will be seen that all dirt and foreign matter will be removed from the oil before it reaches the bearings. Thus, the bearings are protected against wear with its inevitable inaccuracies. The whole system is of suiiicient size to provide an abundant supply of oil for the bearings and the large, unsightly oil-cups heretofore required are done away with. As the ducts are all drilled into the head, thevhead can kbe made very attractive in appearance and smooth outlines maintained. The level of' oil in the pocket 112 will be always the same as the level of oil inthe ball-race, so that by a glance through the sight-glass 123, the amount of oil in the race can be determined.

The gears to be tested or lapped can be secured -to their respective spindles 50 and 95 by any suitable type of chucking mechanism. TWhere cluster gears, such as shown inFigure 2, or other lggears, which require to be mounted at a considerable distance from the nose of the spindle 5,0, are to be lapped or tested, it is advisable to employ a tailcenter or steady-rest to support the gear shaft at its outer end. .For this purpose, there is detachable tail-center or steady-rest provided with this machine. One form of such rest is shown in Figure 10 and another form in Figures 11 and 12.

Referring first to Figure 10, designates the tail-stock or support. This support 130 is bored to receive the ball-bearings 131 and 132 in which the center 133 is mounted. The center is secured in position by the nut CTI 134 and the ball bearings are held in place by the spacer-.185 and the end-plates 136 and 187, the latter being secured together by the bolts 188. rThe bearings can be lubricated from the litting 189 through the duct 140.

'l` he support 130 is adapted to be held in position on the machine with the tail-center 188 in alignment with the axis of the spindle 50 by means of a T-bolt142, the head of which can be engaged with the T-slot 48, already referred to (Figures 4 and 10). rlhe 1`slot 48 is open at its inner end as indicated at 143 in Figures 12, 10, and 15 so that the head of the bolt can be readily lifted out of the slot or inserted in the slot to permit removal from or positioning of the .supporton the frame. As the slot 48 extendsy parallel to the axis of the spindle 50, it will be seen that the support 136 can be adjusted on the frame to any desir-ed distance from the nose of the spindle 56 and the center 188 will always remain in alignment with the axis of the spindle 50. The bolt 142 can be tightened to secure the support in any adjusted position by means of a lever 145 (Figures 2 and 10), which threads onto the upper end of the bolt.

The tail-stock or support 147 (Figs. 11 and 12) is secured on the frame in the same manner as the support 130, namely, by means of a 'im-bolt, the head of which is engaged with the slot 48. This support 147 ditfers in construction from the support 186 in that the center itself is adjustable in the support. Hence, with the support 147, a rough adjustment can be had by moving the support 147 itself on the frame and a liner adjustment can be had by moving the center 146 lin the support 147.

The center 146 is ournaled in the bearings 148 and 149 which are secured in a sleeve 1.50 by means of a nut 151. A. spacer 152 maintains the bearings at the proper distance apart and the center-"146 is Lecured in the bearings by the nut 154. A series of raclr teeth are cutv in the sleeve 150, as indicated at 155. These teeth mesh with the teethr of a spur gear 156 which is keyed to a shaft 157 which can be rotated by the handwh-eel 158 that is keyed to its outer end. rlhe sleeve can be clamped in any adjusted position by means of the blocks 160 and 161 which have curved faces to engage the periphery ofthe sleeve 156.A The bloclr- 161 is held in position by 'the headed end 162 of the shaft 157, while the two blocks are forced together by manip- Yulation of the hand-wheel 164. lThis hand wheel 164 is keyed to a nut 165 which is threaded on the shaft 157 and which has a 'lianged inner end which engages the sleeve 166 that is mounted on the shaft 157 and engages at its inner end, the block 160. By tightening up on lthe hand-wheel 164, the. blocks 166 and 161 can be moved toward each other to clamp the sleeve 15() in any adjusted position and when the blocks are released by are provided to enclose the gears during the lapping operation. The improved typ-e of guard supplied with this machine will noW be described.

rlhe guards are made in sections and are detachable. One section is always used during the lapping operation. This section will be described iirst. This section which is of general box-shape and open at both ends is designated generally by the reference numeral 170 (Figures 1, 8 and 9). 1t consists of a lower cast or sheet-metal trough-member 171 and an upper cast or sheet-metal cover-member 172 which is hingedlyconnected at 173 to the lower part 171. is formed with a lip 174 so that the operator canv readily lift it up out of the way. rllhe upper part 172 is flanged to lit closely in the lower part 171 when the guard is closed.

The front walls of the two parts are provided with openings of sufficient area to permit the shafts of the gears to be tested to pass therethrough.

The section 170 can be secured directly to the end-plate 54 of the spindle 50 or to a spacing section 178 which in turn may be secured to the plate 54.

The spacino' section 178 is of general drumshape. lt is'open front and rear to permit the passage of the gear shaft clampedin the spindle 50 therethrough. The adjacent walls, of the sections 170 and 178 are cut away, as indicated at 179 in Figure 8, to permit the lapping compound to drain from the section 178 back into the trough of the section 170.

A series of sect-ions 17 8 can beprovided which are of different lengths. By taking one of these sections 17 8 off of the machine and substituting another of a different length therefor, th the proper distance from the nose of the spindle 50 to enclose the gears whiCh are being lapped. 1n eases where the gears to be lapped have but little overhang, the section 178 can be taken oit' entirely and the section 170 secured directly to the spindle-plate 54, as indicated above. The section 170 is secured to the section 178 or to the spindleplate 54 by screws 180. The section 178 can be secured to the spindle-plate 54 by screwsy 181. The screws 1,80 and 181 are of the saine size and are spaced the same distances apart on the sections 17 O and 17 8, respectively, so that either set of screws can be threaded into the holes 183 in the flange of the plate 54 to The cover part 172 section 170 can be disposed at i2 secure the section 178 or the section 170 to the plate 511, as described. v

The lapping compound might be applied tothe gears by hand, by chain, or by air. I 5 have found it advantageous to pump the compound onto the gears automatically and in this connection it is to be noted 'that one of the features of the machinek illustrated. is the novel system for pumping and circulating the lapping compound. This will now be described. f The pump may be of any suitable construction. 1 have found it preferable, however, to employ a centrifugal pump.

186 and screws 187 and the'brachet is itself,

in turn, secured to the frame of the machine by means of screws 188.Y The pump is driven from a direct-connected motor 190 that is connectery directly with the propellerspindle 1191 of the pump. This spindle 191 carries the vaned-impeller 192.

j The lapping compound is pumped from a coiff'ered trough or reservoir 19-1 (Figures 1.. 16 and 17) through the pipe 195 that threads into an opening in the bottom of the trough or reservoir, the T 196, and the pipes 197 and 198 which are connected by the union 199. Thepipe 19S th 1eads int-o an opening provided in the side wall of the pump chamber 200.

The impeller 192 forces the compound out of thechamber 200 through the flexible hose 201 and the pipe 202 (Figures 1 and 2) onto the gears. The pipe 202 is secured in a splitclamp 203 which is in turn connected to a split-clamp 2011 that engages a rod 205 which is vertically adjustable in an opening provided in a lug` 206 secured to the trough-part screw 297 serves to hold the rod 205 in any adjusted position. By means of the splitclamp and the rod, thepipe 202 is capable of universai adjustment to direct the lapl-J ping compound onto "the gears at any desired point. shown swung away from the gears to permit the other parts to be clearly illustrated.V

The trough-part 171 of the lapping guard section 170 has an opening at one end as indicated at 210 in Figures 2iand 8, and the. bottoni wall of this trough-part is inclined toward this opening to cause the compoundv The pump isl secured in a bracket 185 by means of a clamp 171 of the lapping guard section 170. 'A set 'i ln Figure 2, the pipe 202 isiiculty has been experienced heretofore in maintaining the 'desired consistency of the` mixture. The abrasive powder tends to settle out and cake. This tendency is completely overcome with the circulating system construction just described. It will be noted that the pump pumps the compound out of the bottom of the reservoir. Thus, the compound has no opportunity to cake. Moreover, as the bottomv of the reservoir 194- is above the. level of the pump chamber 200, there is no low spot inthe system in'which the compound can settle. The cleanout plug 2111, which threads into the T 196 is provided primarily to permit cleaning the compound out of the system .fter it has been used for a long time so as to allow a fresh supply of compound to, be used.

It is not always possible to keep the lapping compound from gettingv past the impeller blades-and up along theshaft 191. Accordingly, holes 216 are provided in the sleeve 215 in which the shaft- 191 is held, through which any compound getting up past the impeller blades can return to the reservoir, being directed back into the reservoir by the lip-member 217 which surrounds the sleeve V215 and extends over the reservoir,

being covered, like the reservoir, by the coverlto .avoid wear because of abrasive getting between the waysV and the heads. The wayguards are of atelesc'oping character.

Secured to the head 21, at its front and rear ends, as by means of screws 220, are aprons 221 and 222, respectively. Threaded into the head beneatheach of these aprons are a pair of rods 223 (Figures 3, 6 and 7). These rods 223 serve as guides for the. telescoping guard section 224. .The section 2211 attached to the rear end of the head is simply a piece of sheet-metahturned down on three sides. The guard 221 for the front end of the head is of similar shape, except that part of its front side is slit and turned up to form a lip 226. i

The guards for the rear portiony of the ways on which the head 21 slides comprise simply the apron 222 and the telescoping section 224i. For' the front portion of the ways,

there is provided, in addition, a detachable guard section 227, which is of approximately half the width of Vthe guard section 22A. The guard section'227 is intended to cover the forward end yof the T-slot i8 when'a tailcenterlis Anotbeing used and this section'227 is removable to permit use of the tail-center. For the purpose of detachably securing the section 227 to the forward section 224, a pair of headed pins 229 are secured in one side of the guard 224 for engagement in the bayonet-slot 230 formed in one side of the guard section-227. In addition, the guard section 227 has a flange231 at its rear end which is adapted to engage over the lip 226 ot the' guard section 224. riho shirts ot the g sections 224 and 227 are. oi' suliicieifit c to extend down over the Ways ad.; of the ,t so that as the head 2l is adjusted onthe frame, the guard sections adjust themselves automatically to the position of. the head,

'telescoping or extending, as required.

The. ,fruards'for the Ways on which the head 22 slides'aro o'l a character similar to the `guards 222 and 219A; secured to the ol the trom 'the machine and the head ot the T--bolt 142 engaged in the T-slot 48. VEhe steady# rest is adjusted until the center engages the shaft 23S to lorm with the spindle 50, a rotary support for this shaft.

The gears 235 and @87am adjust-ef into engagement by movinogthe head 21. and thc steady-rest on the frame in the directiei of 'the axis of the spindle 50 to brine; the Agears into the proper operating' plane and by adjusting; the head '22 on the `trame in a direction perpendicular to the axis oi its spindle 95 to engage the With their axes at the proper center distance.` These adinetments are made., as described, by rotating; the hand-'Wheels and 9].7. respectively. and zitter the head `liasbeen adjusted into proper relation. the two heads are locked in position by manipulation ot the levers 28 and respectively` as described. lt will be noted that only two adjustments are required to brine* anvnears Within the range ot this in achine into proper meshing'relation These tivo adiustments are the adiustment ot the head 21 in thev direction of the axis ot' its spindle, which brings the two into the. proper meshingrplane and the.n liu nent oi' `the vhead 2Q in a direction perpendicular the axis of itsspindle which causes the .frears to engage at the proper center distanro.y

If the gears to be lapped overhang' from the nose of the spindle a distance such as shown in the drawings, both lapping` guard section 170 and. a spacing section 1'? 8 are employed. The length of the spacing' section determined bythe amount of overhang,` oi

the gears. ln cases.v Where the gears to be lapped are cbucled close to thenosesoic their respective spindles, a spacing;` Iguard section I.. 14,8 is unnecessary and the'guard section 1ZO is secured directly to the liront plate 54; of the spindle 50.

T ie lapping oper-atiende effected by run ningg the to ether While pumplngthe lapping compound onto them their mesliing,` points. allie gears are rotated form the motor 9T whi a drives the spindle 95 through the pulleys 9S) and 9G and the belt 98. rilie lgear 287. secured to the spindle 95 drives the gear iThe lapping compound is applied to the gears by action oi the lapping Colnpound pump which pumps the compound from the reservoir 19a'4 through the hose 201 and the pipe 202 onto thelgears. ping hole reversal of motion may be controlled from thereversing; switch 2li-.0 (Figure l) Which controls 'the direction 'of rotation of the motor 97.

s can be tested, it desired, at diii'eri, 1 ol.

is the lappingroperation to deterie progress ot lapping and the characthe lapping pump and running the gears together with or Without load. Loads comparable to those encountered in use can be applied, il desired, by depressing;V .he brake-- i0 o. the nears by depressing the brak-clever 8V. in the test, the gears are run in both directions. Y

lllhile have described my invention in connection 'with a particular embodin'ient and a particular use for that embediment. it Will be und toed that the'invention is capable of various Jturther moifliiicationsand that the eaturcs'oiE the invention are capable oie'varions 'further uses. This application is intended to cover adaptations, uses, or embodi-` ments oli the present invention following, in general.4 the principles of the invention and incluine` such departures from the ,present disclosure as come Within known or customary practice vin the gearart and" as may be appliedy to the essential features hereinbeoreY tooth-bearing; bv sini )lv shuttinfr oii set forth and as fall within the scope of the invention or the limits of the appended claims.

flaving thus described my invention, what naled therein ai'ljustable on thetrame in the direction ot adjustment of one slide and adapted rto cooperate with the spindle carried by said slide to detachably support a spur gear therebetween, means for detachably securingv a spur gear to the other spindle, means for adjusting one et said slides in a direction parallel to the axis of its spindle, means for adjusting' the other slide in a direction at right angles to the direction otadjustment of the lirst slide, cooperating means on the 'trame and tail-stoel; 'for guiding; the tail-stock in its adjustment, and means for rotating' one of said spindles to rotate 'the ,Q'ears in mesh'.

2. ln a machine of the class described, a trame, a pair of slides adjustably mounted on the frame, a spindle jonrnaled in each slide so that the axes of the two spindles are parall el., means for adj listing' one olf said slides in a direction parallel to the axis of its spindle, means tor adj listingv the other slide in a direction at right angles to the direction oi" adjustment of the first slide., a tan-stock adjustable on the trame in the direct-ion oi adjustment of the lirst slide, a rotatable center carried by the tail-stocl-r, means :tor guiding' the tailst cl; in its adjustment so that the center remains aligned with the axis ot the spindle carried by the :First slide throughout the adjustment ot' said tail-stock, said tail-stock cooperating; with said spindle to detachably support a spur gear therebetween, means lor detachably securing' a spur gear to the other spind e, and means for rotating' one ot said spindles to rotate the t vo gears in mes i.

3. ln a machine of the class described, a trame. a pair ot slides adjustably mounted on the "frame, a spindle ournaled in each slide so that the of the two spindles are parallel, means for adjusting' one of said slides in a direction parallel to the axis olf its spindl l neans for adjusting` the other slide in a direction at right angles to the direccion ot adjustment ot the first slide, said frame being' formed with a ul`slot in its upper face extending' in the direction of adjustment of the lirst slide, a tail-stock mounted on the trame for adjustment in th-e direction of adjustment of the first slide, a T-bolt the head of which is cngageable in said'T-slot for securing' the tail-stock in any adjusted position, a center rotatably mounted in the tail-stock adapted to coope 'ate with the spindie carried by the first slide to support a spur gear therebetween, means for detachably securingv a spur gear to the other spindle, and

means 'for rotating one oi' said spindles to rot-ate vthc two gears in mesh.

el. In a machine of `the class described, a iframe, a pair of slides adjustably mounted on the frame, a spindle journaled on each slide so that the axes oi the two spindles parallel, means tor detachably securing a spur gear to each of said spindles,means for adjusting one of said slides in a direction parallel to the axis et its spindle, means 'for adjusting the other slide in a direction at right angles to the direction of adjustment of the slide, said Vtrame being' formed with a T-slot in its upper tace extending' in the direction of adjustment of the lirst slide, a set of telescopingv guards secured to the iirst slide and adapted to cover the exposed parts of the framev and slot as said slide is adjusted on the frame, one of said guards being' detachable to permit a tail-stock to be adjustably secured to 'the frame, said tail-stock having a center rotata- `ly mounted thereon in alignment with the axis ot the tirst spindle, said center being adapted to c0 perate with the first spindle to mount a spur gear therebetween, a T-bolt carried by said tail-stock, the head of which is engageable in said T-slot to secure the tailstoclr in any adjusted position on the frame, said slot being' open at one end to permit en.- gage nent of the head ot' the bolt therewith and removal therefrom to permit the tailstoclr to be secured to or removed from the trame, and means for rotating one of said spindles to rotate the gears in mesh.

5. ln a machine of the class described, a frame, a pair of slides adjustably mounted on the trame, a spindle journaled in each slide so that the aXes of the two spindles are parallel, means for adjusting one of the slides in a direction parallel to the axis of its spindle, means tor adjusting the other slide in a direction at right angles to the direction of adjustment of the lirst slide, a tail-stock adjustable on the frame in the direction of adjustment of the first slide, a rotatable center carried by the tail-stock in alignment with the axis of the spindle carried by the first slide and adapted to co-operate with said spindle to detachably support a spur gear,

said center being" mounted on anti-friction bearings in a sleeve carried by said tailstock, means for securing' the tail-stock in any adjusted position, means for adjusting the sleeve relative to said tail-stock to move the center toward and from the spindle with which it co-operates, means for locking the sleeve in any adjusted position, means for securing' a spur gear to the other spindle, and

means for rotating one of said spindles to rotate 'the two gears in mesh.

6. In a machine 01"' the class described, a frame, a pair of slides adjustable on the frame, a spindle journaled in each slide so that the ailes of the two spindles are parallel, means for detachably securing a spur which may loe used selectively the projecting portions of which are of' different lengths, said guards permitting, therefore, accommodation of gears which require to be chucked at dillereut distances from the noses of the two spindles, and means for rotating one of seidl spindles to rotate the tWo gears in mes '1.

BERNARD J. WOLFE. 

